tools/testing/selftests/bpf/prog_tests/test_overhead.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/prog_tests/test_overhead.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/prog_tests/test_overhead.c
Extension
.c
Size
3857 bytes
Lines
149
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

if (err < 0) {
			CHECK(err < 0, "task rename", "err %d", errno);
			close(fd);
			return -1;
		}
	}
	printf("task_rename %s\t%lluK events per sec\n", prog,
	       MAX_CNT * 1000000ll / (time_get_ns() - start_time));
	close(fd);
	return 0;
}

static void test_run(const char *prog)
{
	test_task_rename(prog);
}

static void setaffinity(void)
{
	cpu_set_t cpuset;
	int cpu = 0;

	CPU_ZERO(&cpuset);
	CPU_SET(cpu, &cpuset);
	sched_setaffinity(0, sizeof(cpuset), &cpuset);
}

void test_test_overhead(void)
{
	const char *kprobe_name = "prog1";
	const char *kretprobe_name = "prog2";
	const char *raw_tp_name = "prog3";
	const char *fentry_name = "prog4";
	const char *fexit_name = "prog5";
	const char *kprobe_func = "__set_task_comm";
	struct bpf_program *kprobe_prog, *kretprobe_prog, *raw_tp_prog;
	struct bpf_program *fentry_prog, *fexit_prog;
	struct bpf_object *obj;
	struct bpf_link *link;
	int err, duration = 0;
	char comm[16] = {};

	if (CHECK_FAIL(prctl(PR_GET_NAME, comm, 0L, 0L, 0L)))
		return;

	obj = bpf_object__open_file("./test_overhead.bpf.o", NULL);
	if (!ASSERT_OK_PTR(obj, "obj_open_file"))
		return;

	kprobe_prog = bpf_object__find_program_by_name(obj, kprobe_name);
	if (CHECK(!kprobe_prog, "find_probe",
		  "prog '%s' not found\n", kprobe_name))
		goto cleanup;
	kretprobe_prog = bpf_object__find_program_by_name(obj, kretprobe_name);
	if (CHECK(!kretprobe_prog, "find_probe",
		  "prog '%s' not found\n", kretprobe_name))
		goto cleanup;
	raw_tp_prog = bpf_object__find_program_by_name(obj, raw_tp_name);
	if (CHECK(!raw_tp_prog, "find_probe",
		  "prog '%s' not found\n", raw_tp_name))
		goto cleanup;
	fentry_prog = bpf_object__find_program_by_name(obj, fentry_name);
	if (CHECK(!fentry_prog, "find_probe",
		  "prog '%s' not found\n", fentry_name))
		goto cleanup;
	fexit_prog = bpf_object__find_program_by_name(obj, fexit_name);
	if (CHECK(!fexit_prog, "find_probe",
		  "prog '%s' not found\n", fexit_name))
		goto cleanup;
	err = bpf_object__load(obj);
	if (CHECK(err, "obj_load", "err %d\n", err))
		goto cleanup;

	setaffinity();

	/* base line run */
	test_run("base");

	/* attach kprobe */
	link = bpf_program__attach_kprobe(kprobe_prog, false /* retprobe */,
					  kprobe_func);
	if (!ASSERT_OK_PTR(link, "attach_kprobe"))
		goto cleanup;
	test_run("kprobe");
	bpf_link__destroy(link);

	/* attach kretprobe */
	link = bpf_program__attach_kprobe(kretprobe_prog, true /* retprobe */,
					  kprobe_func);
	if (!ASSERT_OK_PTR(link, "attach_kretprobe"))

Annotation

Implementation Notes